Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent
1986-01-22
1987-09-01
Novosad, Stephen J.
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
175393, 175408, E21B 1060, E21B 1710
Patent
active
046902295
ABSTRACT:
A stabilized drill bit has a cylindrical main body, a formation cutting face at the lower end of the body, and means by which the upper end of the bit can be connected into a drill string. A drilling fluid flow passageway extends axially through the main body and provides flow of drilling fluid to the drilling face. A plurality of hydraulic actuated stabilizing members are arranged circumferentially about the throat and within the main body. Stabilizing members have a borehole wall engaging face thereon which can be retracted flush with the outer surface of the main body, and extended away from the main body face and into contact with the borehole wall, thereby stabilizing the drill bit as the bit is rotated while making hole. Hydraulic means is connected to the stabilizing members by which the members are progressively extended toward the borehole wall as the members become worn, and which normally prevents retraction of the stabilizing members so long as drilling fluid pressure is effected within the passageway. The stabilizing members are retracted when the drilling fluid is reduced to a predetermined value.
REFERENCES:
patent: 712887 (1902-11-01), Wyczynski
patent: 2857141 (1958-10-01), Carpenter
patent: 3062303 (1962-11-01), Schultz
patent: 3123162 (1964-03-01), Rowley
patent: 3225843 (1965-12-01), Ortloff et al.
patent: 3512592 (1970-05-01), Kellner
patent: 4022287 (1977-05-01), Lundstrom et al.
patent: 4190123 (1980-02-01), Roddy
patent: 4253533 (1981-03-01), Baker
patent: 4351402 (1982-09-01), Gonzalez
Bates Marcus L.
Melius Terry Lee
Novosad Stephen J.
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